E.g.f.: exp(4*x*G(x)^3) / G(x) where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.

A251664

E.g.f.: exp(4*x*G(x)^3) / G(x) where G(x) = 1 + x*G(x)^4 is the g.f. of A002293.

Terms

    a(0) =1a(1) =3a(2) =26a(3) =430a(4) =10872a(5) =373664a(6) =16295152a(7) =862486944a(8) =53729041280

External references